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JP2007073764A - Electronic circuit unit - Google Patents

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Publication number
JP2007073764A
JP2007073764A JP2005259705A JP2005259705A JP2007073764A JP 2007073764 A JP2007073764 A JP 2007073764A JP 2005259705 A JP2005259705 A JP 2005259705A JP 2005259705 A JP2005259705 A JP 2005259705A JP 2007073764 A JP2007073764 A JP 2007073764A
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Prior art keywords
base member
circuit board
circuit unit
cover member
back surface
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Abandoned
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JP2005259705A
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Japanese (ja)
Inventor
Haruaki Motoda
晴晃 元田
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Hitachi Ltd
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Hitachi Ltd
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Priority to JP2005259705A priority Critical patent/JP2007073764A/en
Publication of JP2007073764A publication Critical patent/JP2007073764A/en
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Abstract

【課題】 電子回路ユニットにおいて、防水状態の回路基板の放熱を良好に行なう。
【解決手段】 回路基板を防水状態で収納する防水ケース2を、表面で回路基板の裏面を支持する金属製のベース部材6と、回路基板の表面を覆ってベース部材6に固定された樹脂製のカバー部材7とから構成し、ベース部材6の裏面6fを露出させることにより、回路基板3において電子部品4から生じた熱がベース部材6を伝わってその裏面6fから放出される。
【選択図】 図2
PROBLEM TO BE SOLVED To favorably dissipate a waterproof circuit board in an electronic circuit unit.
A waterproof case for storing a circuit board in a waterproof state is made of a metal base member that supports the back surface of the circuit board on the front surface, and a resin that covers the surface of the circuit board and is fixed to the base member. By exposing the back surface 6f of the base member 6, heat generated from the electronic component 4 in the circuit board 3 is transmitted through the base member 6 and released from the back surface 6f.
[Selection] Figure 2

Description

本発明は、電子回路ユニットに関する。   The present invention relates to an electronic circuit unit.

従来、電子部品とこの電子部品に導通するコネクタとを表面に搭載した回路基板を箱体に収納し、この箱体内部に充填した樹脂によって回路基板を被覆し、回路基板を防水する電子回路ユニットが知られている(例えば、特許文献1参照)。
特開平7−221429号公報
2. Description of the Related Art Conventionally, an electronic circuit unit in which a circuit board having an electronic component and a connector conducting to the electronic component mounted on the surface is housed in a box, the circuit board is covered with a resin filled in the box, and the circuit board is waterproofed Is known (see, for example, Patent Document 1).
JP-A-7-212429

しかしながら、このような電子回路ユニットは、回路基板全体を樹脂によって被覆しているので、回路基板の放熱が困難であるという問題がある。   However, such an electronic circuit unit has a problem that it is difficult to dissipate heat from the circuit board because the entire circuit board is covered with resin.

本発明は、上記事情に鑑みてなされたものであり、その目的は、電子回路ユニットにおいて、防水状態の回路基板の放熱を良好に行なうことである。   The present invention has been made in view of the above circumstances, and an object thereof is to satisfactorily dissipate a waterproof circuit board in an electronic circuit unit.

上記目的を達成するために、請求項1の発明は、電子部品とこの電子部品に導通するコネクタとを表面に搭載した回路基板と、表面で前記回路基板の裏面を支持する金属製のベース部材と前記回路基板の表面を覆って前記ベース部材に固定された樹脂製のカバー部材とを有し、前記コネクタの接続部を露出させた状態で前記回路基板を防水状態で収納する防水ケースと、を備え、前記ベース部材の裏面が露出している。   In order to achieve the above object, a first aspect of the present invention provides a circuit board having an electronic component and a connector conducting to the electronic component mounted on the surface, and a metal base member that supports the back surface of the circuit board on the surface. And a resin cover member that covers the surface of the circuit board and is fixed to the base member, and a waterproof case for storing the circuit board in a waterproof state with the connection portion of the connector exposed, The back surface of the base member is exposed.

したがって、防水状態とされた回路基板で発生した熱は金属製のベース部材を伝わってベース部材の裏面から放出されるので、回路基板の放熱を良好に行なうことができる。   Therefore, the heat generated in the waterproof circuit board is transmitted through the metal base member and released from the back surface of the base member, so that the circuit board can be radiated well.

また、請求項2の発明は、請求項1の発明において、前記ベース部材における前記カバー部材が固定される固定部には、該固定部と前記カバー部材とを密着させるための表面処理が施されている。   According to a second aspect of the present invention, in the first aspect of the invention, the fixing portion of the base member to which the cover member is fixed is subjected to a surface treatment for bringing the fixing portion and the cover member into close contact with each other. ing.

したがって、固定部に施された表面処理によって固定部とカバー部材との密着性が、固定部に表面処理が施されていない場合に比べて、向上しているので、防水ケース内への水の侵入をより確実に阻止することができ、よって、回路基板を良好な防水状態とすることができる。   Therefore, the adhesion between the fixing part and the cover member is improved by the surface treatment applied to the fixing part as compared with the case where the fixing part is not subjected to the surface treatment. Intrusion can be more reliably prevented, and thus the circuit board can be in a good waterproof state.

また、請求項3の発明は、請求項1又は2の発明において、前記ベース部材は、前記回路基板の裏面を支持する基板支持部と、該ベース部材を外部部材に取り付けるための取付部と、これら基板支持部と取付部とを連結する連結部とからなり、前記カバー部材は、前記ベース部材に対しては、前記基板支持部又は前記基板支持部及び前記連結部のみを覆っている。   The invention according to claim 3 is the invention according to claim 1 or 2, wherein the base member includes a substrate support portion that supports the back surface of the circuit board, and an attachment portion for attaching the base member to an external member; The cover member covers only the substrate support portion or the substrate support portion and the connection portion with respect to the base member.

したがって、例えば、カバー部材をアウトサート成形によって回路基板とベース部材とに一体化させて設ける場合、取付部にはカバー部材から直接には熱が伝わらないことから、取付部も樹脂カバーで覆う場合に比べて、アウトサート成形時に樹脂材料からベース部材に伝達する熱の量が少なくなるので、よって、アウトサート成形時にベース部材が熱変形することを抑制することができる。   Therefore, for example, when the cover member is provided integrally with the circuit board and the base member by outsert molding, heat is not transferred directly from the cover member to the mounting portion, and therefore the mounting portion is also covered with a resin cover. Compared to the above, since the amount of heat transferred from the resin material to the base member during the outsert molding is reduced, it is possible to suppress the base member from being thermally deformed during the outsert molding.

本発明の一実施形態を図面を参照して説明する。図1は、本実施形態にかかる電子回路ユニットをその表面側から見て示す斜視図、図2は、電子回路ユニットをその裏面側から見て示す斜視図、図3は、電子回路ユニットの内部構造を示す斜視図、図4は、電子回路ユニットのベース部材を示す斜視図である。   An embodiment of the present invention will be described with reference to the drawings. 1 is a perspective view showing the electronic circuit unit according to the present embodiment as viewed from the front surface side, FIG. 2 is a perspective view showing the electronic circuit unit as viewed from the back surface side, and FIG. 3 is an internal view of the electronic circuit unit. FIG. 4 is a perspective view showing a base member of an electronic circuit unit.

図1ないし図3に示すように、電子回路ユニット1は、防水ケース2と、この防水ケース2に収納された回路基板3とを備えている。   As shown in FIGS. 1 to 3, the electronic circuit unit 1 includes a waterproof case 2 and a circuit board 3 accommodated in the waterproof case 2.

回路基板3の表面3aには、電子回路を構成する電子部品4とこの電子部品4に導通するコネクタ5とが搭載されている。電子部品4は、例えば、パワーMOSFETや抵抗素子などである。コネクタ5には、図示しない外部コネクタが接続される接続口5aが形成されている。   On the surface 3 a of the circuit board 3, an electronic component 4 constituting an electronic circuit and a connector 5 conducting to the electronic component 4 are mounted. The electronic component 4 is, for example, a power MOSFET or a resistance element. The connector 5 is formed with a connection port 5a to which an external connector (not shown) is connected.

防水ケース2は、表面6aによって回路基板3の裏面を支持する金属製のベース部材6と、回路基板3の表面3aを覆ってベース部材6に固定された樹脂製のカバー部材7とから構成されており、コネクタ5の接続部を露出させた状態で回路基板3を防水状態で収納している。   The waterproof case 2 includes a metal base member 6 that supports the back surface of the circuit board 3 by the front surface 6a, and a resin cover member 7 that covers the surface 3a of the circuit board 3 and is fixed to the base member 6. The circuit board 3 is stored in a waterproof state with the connection portion of the connector 5 exposed.

ベース部材6は、図3及び図4に示すように、板部材であり、回路基板3の裏面を支持する基板支持部6bと、この基板支持部6bの両端部側にそれぞれ位置する取付部6cと、これら基板支持部6bと取付部6cとを連結する連結部6dとからなっている。基板支持部6bには、回路基板3が当接され、この回路基板3が接着剤やビスによって固定されており、この構造によって、基板支持部6bが回路基板3の裏面を支持している。取付部6cは、ベース部材6を外部部材(図示せず)に取り付けるためのものであり、ネジ孔6eを有している。そして、このネジ孔6eを貫通するネジ(図示せず)によって取付部6cが外部部材に締結されることにより、電子回路ユニット1が外部部材に固定される。このようなベース部材6の裏面6fは、露出している(図2参照)。ベース部材6は、金属製であり、樹脂製のカバー部材7よりも熱伝導性が良い。具体的には、本実施形態では、ベース部材6は、アルミニウムによって構成されている。   As shown in FIGS. 3 and 4, the base member 6 is a plate member, and includes a substrate support portion 6 b that supports the back surface of the circuit board 3, and attachment portions 6 c that are positioned on both ends of the substrate support portion 6 b. And a connecting portion 6d for connecting the substrate supporting portion 6b and the attaching portion 6c. The circuit board 3 is brought into contact with the board support part 6b, and the circuit board 3 is fixed with an adhesive or a screw. The board support part 6b supports the back surface of the circuit board 3 by this structure. The attachment portion 6c is for attaching the base member 6 to an external member (not shown), and has a screw hole 6e. And the electronic circuit unit 1 is fixed to an external member by the attachment part 6c being fastened by the external member with the screw (not shown) which penetrates this screw hole 6e. Such a back surface 6f of the base member 6 is exposed (see FIG. 2). The base member 6 is made of metal and has better thermal conductivity than the resin cover member 7. Specifically, in this embodiment, the base member 6 is made of aluminum.

ベース部材6において、基板支持部6bの縁部の表面及び側面と、連結部6dの表面及び側面とは、カバー部材7が固定される固定部6gとされている。この固定部6gには、該固定部6gとカバー部材7とを密着させるための表面処理が施されている。この表面処理は、プラズマ処理、コロナ放電処理、メッキ処理などである。   In the base member 6, the surface and side surfaces of the edge portion of the substrate support portion 6 b and the surface and side surfaces of the connecting portion 6 d are fixed portions 6 g to which the cover member 7 is fixed. The fixing portion 6g is subjected to a surface treatment for bringing the fixing portion 6g and the cover member 7 into close contact with each other. This surface treatment includes plasma treatment, corona discharge treatment, plating treatment, and the like.

カバー部材7は、互いに固定された状態の回路基板3及びベース部材6に対してアウトサート成形されて固定されている。即ち、本実施形態では、カバー部材7は、電子部品4を搭載した回路基板3上を密着状態で被覆している。このカバー部材7は、ベース部材6に対しては、基板支持部6b及び連結部6dのみを覆うように成形されている。カバー部材7を構成する樹脂は、アウトサート成形のために、高分子熱可塑性樹脂が採用されている。   The cover member 7 is outsert-molded and fixed to the circuit board 3 and the base member 6 that are fixed to each other. That is, in this embodiment, the cover member 7 covers the circuit board 3 on which the electronic component 4 is mounted in a close contact state. The cover member 7 is formed so as to cover only the substrate support portion 6b and the connecting portion 6d with respect to the base member 6. As the resin constituting the cover member 7, a polymer thermoplastic resin is employed for outsert molding.

このような構成の電子回路ユニット1によれば、回路基板3において駆動された電子部品4から生じた熱は、アルミニウム製のベース部材6を伝わってベース部材6の裏面6fから放出されるので、回路基板3の放熱を良好に行なうことができる。   According to the electronic circuit unit 1 having such a configuration, the heat generated from the electronic component 4 driven on the circuit board 3 is transmitted through the aluminum base member 6 and released from the back surface 6f of the base member 6. The circuit board 3 can be radiated with good heat.

また、本実施形態の電子回路ユニット1は、アルミニウム製のベース部材6と高分子可塑性樹脂製のカバー部材7とによって回路基板3の防水を実現しており、このとき、高分子可塑性樹脂製のカバー部材7がベース部材6の裏面を覆っていない構造であるので、例えば回路基板3の防水のために回路基板3及びベース部材6の全体を高分子可塑性樹脂によって覆う場合に比べて、高分子可塑性樹脂の使用量が少なくて済み、その分、該電子回路ユニット1を安価に実現することができると共に、カバー部材7の成形時間を短くすることができる。   In addition, the electronic circuit unit 1 of the present embodiment realizes waterproofing of the circuit board 3 by the aluminum base member 6 and the polymer plastic resin cover member 7. Since the cover member 7 has a structure that does not cover the back surface of the base member 6, for example, in order to waterproof the circuit board 3, compared to the case where the entire circuit board 3 and the base member 6 are covered with a polymer plastic resin. The amount of the plastic resin used is small, and accordingly, the electronic circuit unit 1 can be realized at low cost and the molding time of the cover member 7 can be shortened.

また、上述したように、例えば回路基板3の防水のために回路基板3及びベース部材6の全体を高分子可塑性樹脂製の防水カバーによって覆う場合、その防水カバーの製造をインサート成形によって行なう場合には、インサート成形時にベース部材を支持する支持ピン用の孔が防水カバーに形成されるため、その孔を埋めなければなないが、本実施の形態の電子回路ユニット1においては、そのようなことが製造上不要であり、その点で有利である。   Further, as described above, for example, when the circuit board 3 and the base member 6 are entirely covered with a waterproof cover made of a polymer plastic resin for waterproofing the circuit board 3, the waterproof cover is manufactured by insert molding. Since the hole for the support pin that supports the base member at the time of insert molding is formed in the waterproof cover, the hole must be filled. In the electronic circuit unit 1 of the present embodiment, such a thing is necessary. Is not necessary for manufacturing, and is advantageous in that respect.

また、ベース部材6におけるカバー部材7が固定される固定部6gに、該固定部6gとカバー部材7とを密着させるための表面処理が施されていることにより、固定部6gに表面処理が施されていない場合に比べて、ベース部材6とカバー部材7との密着性が向上しているので、防水ケース2内への水の侵入をより確実に阻止することができ、よって、回路基板3を良好な防水状態とすることができる。   Further, the fixing portion 6g of the base member 6 to which the cover member 7 is fixed is subjected to a surface treatment for bringing the fixing portion 6g and the cover member 7 into close contact with each other, whereby the fixing portion 6g is subjected to a surface treatment. Since the adhesion between the base member 6 and the cover member 7 is improved as compared with the case where it is not performed, it is possible to more reliably prevent water from entering the waterproof case 2, and thus the circuit board 3. Can be in a good waterproof state.

また、カバー部材7は、ベース部材6に対しては、基板支持部6b及び前記連結部6dのみを覆っていることにより、カバー部材7をアウトサート成形によって回路基板3とベース部材6とに一体化させて設ける場合、取付部6cにはカバー部材7から直接には熱が伝わらないことから、取付部6cも樹脂カバーで覆う場合に比べて、アウトサート成形時に樹脂材料からベース部材6に伝達する熱の量が少なくなるので、アウトサート成形時にベース部材6が熱変形することを抑制することができる。   Further, the cover member 7 covers only the substrate support portion 6b and the connecting portion 6d with respect to the base member 6, so that the cover member 7 is integrated with the circuit board 3 and the base member 6 by outsert molding. Since the heat is not directly transmitted from the cover member 7 to the mounting portion 6c, the resin is transmitted from the resin material to the base member 6 during the outsert molding as compared with the case where the mounting portion 6c is also covered with the resin cover. Since the amount of heat to be reduced is reduced, the base member 6 can be prevented from being thermally deformed during the outsert molding.

また、カバー部材7は、ベース部材6に対しては、基板支持部6b及び連結部6dのみを覆っていることにより、ベース部材6の取付部6cには、カバー部材7が設けられていないので、取付部6cがネジにより締結されても、カバー部材7にはネジの締結力が作用しないので、樹脂製のカバー部材7が破損することを抑制することができる。   Further, since the cover member 7 covers only the substrate support portion 6b and the connecting portion 6d with respect to the base member 6, the cover member 7 is not provided on the attachment portion 6c of the base member 6. Even if the attachment portion 6c is fastened with a screw, since the fastening force of the screw does not act on the cover member 7, it is possible to prevent the resin cover member 7 from being damaged.

なお、本発明は、次のような別の実施形態に具現化することができる。以下の別の実施形態でも上記実施形態と同様の作用および効果を得ることができる。   The present invention can be embodied in another embodiment as follows. In other embodiments described below, the same operations and effects as in the above embodiments can be obtained.

(1)上記各実施形態では、カバー部材7が、ベース部材6に対しては、基板支持部6b及び連結部6dのみを覆っている例を説明したが、カバー部材7は、基板支持部6bのみを覆おうように形成されていても良い。   (1) In each of the above embodiments, the cover member 7 covers the base member 6 so as to cover only the substrate support portion 6b and the connecting portion 6d. However, the cover member 7 includes the substrate support portion 6b. It may be formed so as to cover only.

また、上記実施形態から把握し得る請求項以外の技術思想について、以下にその効果と共に記載する。   Further, technical ideas other than the claims that can be grasped from the above embodiment will be described together with the effects thereof.

(イ)請求項2に記載の電子回路ユニットにおいて、前記ベース部材は、アルミニウム製であることを特徴とする。   (A) In the electronic circuit unit according to claim 2, the base member is made of aluminum.

こうすれば、ベース部材が鉄製の場合に比べて、電子回路ユニットの軽量化を図ることができる。   In this way, the electronic circuit unit can be reduced in weight as compared with the case where the base member is made of iron.

本発明の一実施形態にかかる電子回路ユニットをその表面側から見て示す斜視図である。It is a perspective view which shows the electronic circuit unit concerning one Embodiment of this invention seeing from the surface side. 本発明の一実施形態にかかる電子回路ユニットをその裏面側から見て示す斜視図である。It is a perspective view which shows the electronic circuit unit concerning one Embodiment of this invention seeing from the back surface side. 本発明の一実施形態にかかる電子回路ユニットの内部構造を示す斜視図である。It is a perspective view which shows the internal structure of the electronic circuit unit concerning one Embodiment of this invention. 本発明の一実施形態にかかる電子回路ユニットのベース部材を示す斜視図である。It is a perspective view which shows the base member of the electronic circuit unit concerning one Embodiment of this invention.

符号の説明Explanation of symbols

1 電子回路ユニット
2 防水ケース
3 回路基板
3a 回路基板の表面
4 電子部品
5 コネクタ
6 ベース部材
6a ベース部材の表面
6b 基板支持部
6c 取付部
6d 連結部
6f ベース部材の裏面
6g 固定部
7 カバー部材

DESCRIPTION OF SYMBOLS 1 Electronic circuit unit 2 Waterproof case 3 Circuit board 3a Circuit board surface 4 Electronic component 5 Connector 6 Base member 6a Base member surface 6b Substrate support part 6c Mounting part 6d Connection part 6f Back surface of base member 6g Fixing part 7 Cover member

Claims (3)

電子部品とこの電子部品に導通するコネクタとを表面に搭載した回路基板と、
表面で前記回路基板の裏面を支持する金属製のベース部材と前記回路基板の表面を覆って前記ベース部材に固定された樹脂製のカバー部材とを有し、前記コネクタの接続部を露出させた状態で前記回路基板を防水状態で収納する防水ケースと、
を備え、
前記ベース部材の裏面が露出している電子回路ユニット。
A circuit board having an electronic component and a connector conducting to the electronic component mounted on the surface;
It has a metal base member that supports the back surface of the circuit board on the front surface and a resin cover member that covers the surface of the circuit board and is fixed to the base member, and exposes the connector connecting portion. A waterproof case for storing the circuit board in a waterproof state in a state;
With
An electronic circuit unit in which a back surface of the base member is exposed.
前記ベース部材における前記カバー部材が固定される固定部には、該固定部と前記カバー部材とを密着させるための表面処理が施されている請求項1に記載の電子回路ユニット。   2. The electronic circuit unit according to claim 1, wherein a surface treatment for bringing the fixing part and the cover member into close contact is performed on a fixing part of the base member to which the cover member is fixed. 前記ベース部材は、前記回路基板の裏面を支持する基板支持部と、該ベース部材を外部部材に取り付けるための取付部と、これら基板支持部と取付部とを連結する連結部とからなり、
前記カバー部材は、前記ベース部材に対しては、前記基板支持部又は前記基板支持部及び前記連結部のみを覆っている請求項1又は2に記載の電子回路ユニット。

The base member includes a substrate support portion that supports the back surface of the circuit board, an attachment portion for attaching the base member to an external member, and a connecting portion that connects the substrate support portion and the attachment portion.
The electronic circuit unit according to claim 1, wherein the cover member covers only the substrate support portion or the substrate support portion and the connection portion with respect to the base member.

JP2005259705A 2005-09-07 2005-09-07 Electronic circuit unit Abandoned JP2007073764A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2005259705A JP2007073764A (en) 2005-09-07 2005-09-07 Electronic circuit unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2005259705A JP2007073764A (en) 2005-09-07 2005-09-07 Electronic circuit unit

Publications (1)

Publication Number Publication Date
JP2007073764A true JP2007073764A (en) 2007-03-22

Family

ID=37934951

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2005259705A Abandoned JP2007073764A (en) 2005-09-07 2005-09-07 Electronic circuit unit

Country Status (1)

Country Link
JP (1) JP2007073764A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018201086A1 (en) 2017-01-24 2018-07-26 Mitsubishi Electric Corporation Electronic device unit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018201086A1 (en) 2017-01-24 2018-07-26 Mitsubishi Electric Corporation Electronic device unit
US10251285B2 (en) 2017-01-24 2019-04-02 Mitsubishi Electric Corporation Electronic apparatus unit

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